Create libsoftether.so and dynamically link the userland.

Sharing object code between vpnbridge, vpnclient, vpnserver, and vpncmd
reduces the binary size of SoftEther by 85% and its administrative memory
footprint by 50%.

configure.ac

@@ -30,6 +30,7 @@ AC_CONFIG_FILES([
 	src/Mayaqua/Makefile
 	src/Cedar/Makefile
 	src/hamcorebuilder/Makefile
+	src/libsoftether/Makefile
 	src/bin/hamcore/Makefile
 	src/vpnserver/Makefile
 	src/vpnclient/Makefile

src/Makefile.am

@@ -22,5 +22,8 @@ SUBDIRS = Mayaqua Cedar
 # This is a nodist helper.
 SUBDIRS += hamcorebuilder
 
-# These are final build products.
-SUBDIRS += bin/hamcore vpnserver vpnclient vpnbridge vpncmd
+# These are shared components.
+SUBDIRS += libsoftether bin/hamcore
+
+# These are the final build products.
+SUBDIRS += vpnserver vpnclient vpnbridge vpncmd

src/libsoftether/Makefile.am

@@ -0,0 +1,34 @@
+#  Copyright 2014 Darik Horn <dajhorn@vanadac.com>
+#
+#  This file is part of SoftEther.
+#
+#  SoftEther is free software: you can redistribute it and/or modify it under
+#  the terms of the GNU General Public License as published by the Free 
+#  Software Foundation, either version 2 of the License, or (at your option)
+#  any later version.
+#
+#  SoftEther is distributed in the hope that it will be useful, but WITHOUT ANY
+#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+#  details.
+#
+#  You should have received a copy of the GNU General Public License along with
+#  SoftEther.  If not, see <http://www.gnu.org/licenses/>.
+
+
+include $(top_srcdir)/autotools/softether.am
+
+lib_LTLIBRARIES = \
+	libsoftether.la
+
+libsoftether_la_SOURCES =
+
+libsoftether_la_LDFLAGS = \
+	-avoid-version
+
+libsoftether_la_LIBTOOLFLAGS = \
+	--tag=disable-static
+
+libsoftether_la_LIBADD = \
+	$(top_builddir)/src/Mayaqua/libmayaqua.la \
+	$(top_builddir)/src/Cedar/libcedar.la

src/vpnbridge/Makefile.am

@@ -25,5 +25,4 @@ vpnbridge_SOURCES = \
 	vpnbridge.c
 
 vpnbridge_LDADD = \
-	$(top_builddir)/src/Mayaqua/libmayaqua.la \
-	$(top_builddir)/src/Cedar/libcedar.la
+	$(top_builddir)/src/libsoftether/libsoftether.la

src/vpnclient/Makefile.am

@@ -25,5 +25,4 @@ vpnclient_SOURCES = \
 	vpncsvc.c
 
 vpnclient_LDADD = \
-	$(top_builddir)/src/Mayaqua/libmayaqua.la \
-	$(top_builddir)/src/Cedar/libcedar.la
+	$(top_builddir)/src/libsoftether/libsoftether.la

src/vpncmd/Makefile.am

@@ -25,5 +25,4 @@ vpncmd_SOURCES = \
 	vpncmd.c
 
 vpncmd_LDADD = \
-	$(top_builddir)/src/Mayaqua/libmayaqua.la \
-	$(top_builddir)/src/Cedar/libcedar.la
+	$(top_builddir)/src/libsoftether/libsoftether.la

src/vpnserver/Makefile.am

@@ -25,5 +25,4 @@ vpnserver_SOURCES = \
 	vpnserver.c
 
 vpnserver_LDADD = \
-	$(top_builddir)/src/Mayaqua/libmayaqua.la \
-	$(top_builddir)/src/Cedar/libcedar.la
+	$(top_builddir)/src/libsoftether/libsoftether.la